111321421837 has 4 divisors (see below), whose sum is σ = 116161483680. Its totient is φ = 106481359996.

The previous prime is 111321421811. The next prime is 111321421889. The reversal of 111321421837 is 738124123111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 738124123111 = 1373 ⋅537599507.

It is a cyclic number.

It is not a de Polignac number, because 111321421837 - 2⁷ = 111321421709 is a prime.

It is a super-2 number, since 2×111321421837² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111321428837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2420030887 + ... + 2420030932.

It is an arithmetic number, because the mean of its divisors is an integer number (29040370920).

Almost surely, 2^111321421837 is an apocalyptic number.

It is an amenable number.

111321421837 is a deficient number, since it is larger than the sum of its proper divisors (4840061843).

111321421837 is an equidigital number, since it uses as much as digits as its factorization.

111321421837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840061842.

The product of its digits is 8064, while the sum is 34.

Adding to 111321421837 its reverse (738124123111), we get a palindrome (849445544948).

The spelling of 111321421837 in words is "one hundred eleven billion, three hundred twenty-one million, four hundred twenty-one thousand, eight hundred thirty-seven".